Question

{-x<-7,{x<10; срочно помагите​ Смотреть ответ matilda17562 matilda17562 Ответ: (7; 10). Пошаговое объяснение: {-x < -7, {x < 10; {х > 7, {x < 10; (7; 10). Новые вопросы в Математика Допоможіть будь ласка з четвертим завданням даю 15 балів Розвʼяжи задачу. Уяви, що у тебе є 3 місяці, щоб зібрати гроші на маску для дайвінгу, яка коштує 640 грн. Обчисли. Якщо від-кладати однакову суму щоти … жня, скільки треба заощаджувати за тиждень? Позначте на координатній площині точки М (0; 4), К (-3; -2) і А (3; 6). Проведіть пряму МК. Через точку А проведіть пряму а, паралельну прямій МК, і п … ряму b, перпендикулярну до прямої МК рiнок? в) Оленка задумала число. Якщо його збільшити в три рази, а по- тім зменшити на 10, отримаємо число, яке вдвічі менше від задумано- го. Яке чис … ло задумала Оленка? у відповіді має вийти -99 але я не знаю як її розвязати​ г) У першій коробці лежало у 8 разів більше ручок, ніж у другій. Після того як із першої коробки взяли 2 ручки, а в другу поклали 12 ручок, в обох кор … обках ручок стало порівну. Скільки ручок лежало в другій коробці спочатку?​ Предыдущий Следующий Вместе мы знаем больше Этот сайт использует cookies Политика Cookies . Вы можете указать условия хранения и доступ к cookies в своем браузере. 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Answer 1

Давайте посмотрим на ваш запрос. В первой части, вы просите объяснения для неравенства -x < -7 и x < 10. Давайте разберемся с этим.

1. -x < -7: Для решения этого неравенства, давайте умножим обе стороны на -1, но помним, что при умножении на отрицательное число неравенство меняет знак:

-x < -7 x > 7

Таким образом, решение этого неравенства - это x > 7.

2. x < 10: Это неравенство уже является простым. Решение - x < 10, что означает, что x должно быть меньше 10.

Теперь объединим оба решения:

x > 7 (из первого неравенства) x < 10 (из второго неравенства)

Это неравенство означает, что x должно быть больше 7 и меньше 10, то есть интервал (7; 10).

Что касается вашего следующего вопроса о задаче с собиранием денег на маску для дайвинга, я могу помочь, но мне нужны дополнительные данные о том, сколько месяцев вам нужно собрать эту сумму и какую сумму вы готовы откладывать каждый месяц. Пожалуйста, уточните эту информацию, и я помогу вам решить задачу.

Что касается последнего вопроса о числе, которое задумала Оленка, давайте обозначим это число как "х". У нас есть следующая информация:

1. Если увеличить x в три раза, получим число, которое вдвое меньше задуманного числа: 3x = 2x.
2. Затем из этого числа вычитается 10: 3x - 10.

Мы можем записать это как уравнение:

3x - 10 = 2x

Теперь решим это уравнение:

1. Вычитаем 2x из обеих сторон:

3x - 2x - 10 = 0

2. Упрощаем:

x - 10 = 0

3. Добавляем 10 к обеим сторонам:

x = 10

Итак, задуманное число Оленкой равно 10. Но вы говорите, что в ответе должно быть -99. Возможно, в вопросе есть какая-то дополнительная информация или ошибка в формулировке задачи. Если есть дополнительные данные или вопросы, пожалуйста, уточните.